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Example 1 Suppose you have a kite you like and you want to build a larger or smaller version of the kite and you want the same frame flexibility. As an example suppose the original kite uses AFC 2300 pultrude spars and has a 64 inch leading edge. You want to make a kite with a leading edge of around 80 inches (around 10 ft wingspan kite). 80/64 = 1.25 This is the scale factor you want. Go to the chart and note the scale factor for a AFC 2300 spar, 0.958. Take 0.958 times the scale factor you want, 1.25. You get 0.958*1.25=1.1975. Now look on the chart and find the scale factor nearest 1.1975. I get 1.205 which is a Skyshark VIIP spar. If you make your new 80 inch leading edge kite using Skyshark VIIP spars it will have the same frame stiffness as your original 64 in leading edge kite that was sparred with AFC 2300 spars.
Example 2 Through experience designing and building stunt kites I have arrived at some references for stunt kites. For ultralight stunt kites I use as a reference a 64 inch leading edge length and Clearwater 0.202/2 wrap spars. For light wind stunt kites I use as a reference a 64 inch leading edge and Clearwater 0.250/2 wrap spars. For a high wind stunt kite I use as a reference a 64 inch leading edge length and Glass Forms K75 fiberglass spars. For this example let us suppose we want to know how large a kite we can build using the FL616 fiberglass spars. Since this will be a large kite we will probably not want to fly it in high winds, so let us use the lightwind reference. Go to the chart and find the scale factor for the 0.252/2 wrap spar. I find 0.88. Divide the FL616 scale factor of 1.785 by 0.88. I get 2.028. Multiply 2.028 by 64 inches. I get 129.8 as the leading edge length for the new kite.
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